EXAMPLE:
John Doe files an employment discrimination complaint with the FCHR. At that stage he is referred to as the "Complainant". John Doe later files suit at DOAH. Where he becomes a "Petitioner". Ultimately, John Doe withdraws his DOAH suit in exchange for going to federal court. Now that he's in the judicial branch, John Doe is known as the "Plaintiff" in his case.
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Source: Barron's Dictionary of Legal Terms, Steven H. Gifis, 5th Edition; ©